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OPERATING SEGMENT REPORTING (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
OPERATING SEGMENT REPORTING      
Gold and silver sales $ 13,498    
Loss on investment in Minera Santa Cruz S.A., (net of amortization) (237) 3,049  
Production costs applicable to sales 10,593    
Mine development costs 471    
Mine construction costs   4,363  
Exploration costs 14,600 11,784  
Operating loss (18,367) (21,124)  
Investment in Minera Santa Cruz S.A. 273,711   273,948
Mineral property interests 766,675   767,067
Total assets 1,124,963   1,150,937
Argentina
      
OPERATING SEGMENT REPORTING      
Loss on investment in Minera Santa Cruz S.A., (net of amortization) (237) 3,049  
Exploration costs 11,462 4,805  
Operating loss (11,912) (2,423)  
Investment in Minera Santa Cruz S.A. 273,711   273,948
Mineral property interests 539,092   539,092
Total assets 818,172   825,047
Mexico
      
OPERATING SEGMENT REPORTING      
Gold and silver sales 13,498    
Production costs applicable to sales 10,593    
Mine development costs 471    
Mine construction costs   4,363  
Exploration costs 2,485 4,755  
Operating loss (2,050) (10,815)  
Mineral property interests 12,282   12,707
Total assets 46,798   47,359
U.S.
      
OPERATING SEGMENT REPORTING      
Exploration costs 580 1,814  
Operating loss (945) (2,329)  
Mineral property interests 215,301   215,268
Total assets 219,561   220,148
Corporate & Other
      
OPERATING SEGMENT REPORTING      
Exploration costs 73 410  
Operating loss (3,460) (5,557)  
Total assets $ 40,432   $ 58,383